You really think the constructor's matters more to them? It's worth a lot of money. But the driver's title is what brings in the big sponsors, no?

Well, not quite to the extent that Williams values the constructors title over any driver title, but various McLaren statements through the years have indicated their preference and that the see more "prestige" in the constructors championship than the drivers even though the drivers championship undoubtedly garners more attention and therefore sponsor attraction.